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Debt and Credit Facility (Tables)
 12 Months Ended
Mar. 31, 2019
Convertible Debt [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

Debt obligations included in the consolidated balance sheets consisted of the following (in millions):
 
 
Coupon Interest Rate
 
Effective Interest Rate
 
Fair Value of Liability Component at Issuance (1)
 
March 31,
 
 
 
 
 
2019
 
2018
Senior Secured Indebtedness
 
 
 
 
 
 
 
 
 
 
Revolving Credit Facility
 
 
 
 
 
 
 
$
3,266.5

 
$
—

Term Loan Facility
 
 
 
 
 
 
 
1,911.5

 
N/A

2023 Notes, maturing June 1, 2023 ("2023 Notes")
 
4.333
%
 
 
 
 
 
1,000.0

 
N/A

2021 Notes, maturing June 1, 2021 ("2021 Notes")
 
3.922
%
 
 
 
 
 
1,000.0

 
N/A

Total Senior Secured Indebtedness
 
 
 
 
 
 
 
7,178.0

 
—

Senior Subordinated Convertible Debt - Principal Outstanding
 
 
 
 
 
 
 
 
 
 
2017 Senior Convertible Debt, maturing February 15, 2027 ("2017 Senior Convertible Debt")
 
1.625%
 
6.0%
 
$1,396.3
 
$
2,070.0

 
$
2,070.0

2015 Senior Convertible Debt, maturing February 15, 2025 ("2015 Senior Convertible Debt")
 
1.625%
 
5.9%
 
$1,160.1
 
1,725.0

 
1,725.0

Junior Subordinated Convertible Debt - Principal Outstanding
 
 
 
 
 
 
 
 
 
 
2017 Junior Convertible Debt, maturing February 15, 2037 ("2017 Junior Convertible Debt")
 
2.250%
 
7.4%
 
$321.1
 
686.3

 
686.3

Total Convertible Debt
 
 
 
 
 
 
 
4,481.3

 
4,481.3

 
 
 
 
 
 
 
 
 
 
 
Gross long-term debt including current maturities
 
 
 
 
 
 
 
11,659.3

 
4,481.3

Less: Debt discount (2)
 
 
 
 
 
 
 
(1,268.7
)
 
(1,372.9
)
Less: Debt issuance costs (3)
 
 
 
 
 
 
 
(83.6
)
 
(40.1
)
Net long-term debt including current maturities
 
 
 
 
 
 
 
10,307.0

 
3,068.3

Less: Current maturities (4)
 
 
 
 
 
 
 
(1,360.8
)
 
(1,309.9
)
Net long-term debt
 
 
 
 
 
 
 
$
8,946.2

 
$
1,758.4

 
 
 
 
 
 
 
 
 
 
 

(1) As each of the convertible instruments may be settled in cash upon conversion, for accounting purposes, they were bifurcated into a liability component and an equity component, which are both initially recorded at fair value.  The amount allocated to the equity component is the difference between the principal value of the instrument and the fair value of the liability component at issuance.  The resulting debt discount is being amortized to interest expense at the respective effective interest rate over the contractual term of the debt.

(2) The unamortized discount includes the following (in millions):  
 
March 31,
 
2019
 
2018
2023 Notes
$
(4.4
)
 
N/A

2021 Notes
(3.8
)
 
N/A

2017 Senior Convertible Debt
(561.9
)
 
(616.3
)
2015 Senior Convertible Debt
(351.4
)
 
(400.3
)
2017 Junior Convertible Debt
(347.2
)
 
(356.3
)
Total unamortized discount
$
(1,268.7
)
 
$
(1,372.9
)

(3) Debt issuance costs include the following (in millions):
 
March 31,
 
2019
 
2018
Revolving Credit Facility
$
(14.7
)
 
$
(5.9
)
Term Loan Facility
(19.4
)
 
N/A

2023 Notes
(10.2
)
 
N/A

2021 Notes
(8.8
)
 
N/A

2017 Senior Convertible Debt
(14.5
)
 
(16.1
)
2015 Senior Convertible Debt
(12.8
)
 
(14.8
)
2017 Junior Convertible Debt
(3.2
)
 
(3.3
)
Total debt issuance costs
$
(83.6
)
 
$
(40.1
)


(4) Current maturities include the full balance of the 2015 Senior Convertible Debt as of March 31, 2019 and 2018.
Schedule of Unamortized Discount and Debt Issuance Costs The unamortized discount includes the following (in millions):  
 
March 31,
 
2019
 
2018
2023 Notes
$
(4.4
)
 
N/A

2021 Notes
(3.8
)
 
N/A

2017 Senior Convertible Debt
(561.9
)
 
(616.3
)
2015 Senior Convertible Debt
(351.4
)
 
(400.3
)
2017 Junior Convertible Debt
(347.2
)
 
(356.3
)
Total unamortized discount
$
(1,268.7
)
 
$
(1,372.9
)

(3) Debt issuance costs include the following (in millions):
 
March 31,
 
2019
 
2018
Revolving Credit Facility
$
(14.7
)
 
$
(5.9
)
Term Loan Facility
(19.4
)
 
N/A

2023 Notes
(10.2
)
 
N/A

2021 Notes
(8.8
)
 
N/A

2017 Senior Convertible Debt
(14.5
)
 
(16.1
)
2015 Senior Convertible Debt
(12.8
)
 
(14.8
)
2017 Junior Convertible Debt
(3.2
)
 
(3.3
)
Total debt issuance costs
$
(83.6
)
 
$
(40.1
)
Schedule of Maturities of Long-term Debt [Table Text Block]
Expected maturities relating to the Company’s long-term debt as of March 31, 2019 are as follows (in millions):

Fiscal year ending March 31,
 
Expected Maturities
2020
 
$
—

2021
 
—

2022
 
1,000.0

2023
 
—

2024
 
4,266.5

Thereafter
 
6,392.8

Total
 
$
11,659.3
Schedule of Convertible Debt The following table sets forth the applicable Conversion Rates adjusted for dividends declared since issuance of such series of Convertible Debt and the applicable Incremental Share Factors and Maximum Conversion Rates as adjusted for dividends paid since the applicable issuance date:

 
Dividend adjusted rates as of March 31, 2019
 
Conversion Rate, adjusted
 
Approximate Conversion Price, adjusted
 
Incremental Share Factor, adjusted
 
Maximum Conversion Rate, adjusted
2017 Senior Convertible Debt
10.2925

 
$
97.16

 
5.1462

 
14.6668

2015 Senior Convertible Debt
16.0504

 
$
62.30

 
8.0252

 
22.4705

2017 Junior Convertible Debt
10.4763

 
$
95.45

 
5.2382

 
14.6668


The following is the weighted average conversion price per share used in calculating the dilutive effect (See Note 12 for details on the convertible debt):

 
Year Ended March 31,
 
2019
 
2018
 
2017
2007 Junior Convertible Debt (1)
N/A

 
$
23.59

 
$
24.01

2015 Senior Convertible Debt
$
62.86

 
$
63.94

 
$
65.21

2017 Senior Convertible Debt
$
98.03

 
$
99.71

 
$
100.58

2017 Junior Convertible Debt
$
96.31

 
$
97.96

 
$
98.81


(1) No longer outstanding as of December 31, 2017.
Schedule of Interest Expense
Interest expense includes the following (in millions):
 
Year Ended March 31,
 
2019
 
2018
 
2017
Debt issuance amortization
$
12.9

 
$
3.1

 
$
2.4

Debt discount amortization
2.2

 
—

 
—

Interest expense
291.8

 
6.6

 
40.4

Total interest expense on Senior Secured Indebtedness
306.9

 
9.7

 
42.8

Debt issuance amortization
3.6

 
3.5

 
2.1

Debt discount amortization
112.4

 
106.1

 
56.1

Coupon interest expense
77.1

 
77.3

 
44.5

Total interest expense on Convertible Debt
193.1

 
186.9

 
102.7

Other interest expense
2.9

 
2.4

 
0.8

Total interest expense
$
502.9

 
$
199.0

 
$
146.3